Narrative:

Departing ege VMC on the gypsum 4 departure departing runway 25; at 600 ft AGL autopilot was engaged with navigation selected. After an initial turn by the autopilot to the correct heading of 215 degrees; the autopilot then began a right turn direct snow VOR. Due to crew confusion as to what the automation was doing and VMC with climb performance/terrain avoidance not an issue; immediate corrective action was not taken. As the aircraft crossed over snow VOR; what appeared to be the GPS fix for the turn to kirle intersection appeared on the mfd. As the aircraft approached this fix; the fix began 'leap frogging' across the screen preventing intercept by the autopilot. Manual control was taken at this point and corrective vectors on course from denver center were followed. Terrain or weather was never an issue at any time. The remainder of the flight and subsequent legs were completed without further incident. The pilot not flying had experienced a similar episode of a fix 'leap frogging' with the collins equipment in the simulator the week before. The information was given to the hawker acp on duty and forwarded to the appropriate personnel with additional information provided.

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Original NASA ASRS Text

Title: HS-125-800XPC flight crew reported Collins FMS anomalies climbing out of EGE.

Narrative: Departing EGE VMC on the GYPSUM 4 departure departing Runway 25; at 600 FT AGL autopilot was engaged with NAV selected. After an initial turn by the autopilot to the correct heading of 215 degrees; the autopilot then began a right turn direct Snow VOR. Due to crew confusion as to what the automation was doing and VMC with climb performance/terrain avoidance not an issue; immediate corrective action was not taken. As the aircraft crossed over Snow VOR; what appeared to be the GPS fix for the turn to KIRLE intersection appeared on the MFD. As the aircraft approached this fix; the fix began 'leap frogging' across the screen preventing intercept by the autopilot. Manual control was taken at this point and corrective vectors on course from Denver Center were followed. Terrain or weather was never an issue at any time. The remainder of the flight and subsequent legs were completed without further incident. The pilot not flying had experienced a similar episode of a fix 'leap frogging' with the Collins equipment in the simulator the week before. The information was given to the Hawker ACP on duty and forwarded to the appropriate personnel with additional information provided.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.